Diode rectifier filter circuit，Diode half wave rectifier circuit
Diode rectifier filter circuit
Power plant to send 50 Hz AC, after long-distance transmission, to the user is still 50 Hz AC, it is usually sent to industrial users 380 V three-phase AC, to ordinary civil users 220V single-phase AC. Furthermore, diode rectifiers are needed to convert the alternating current of the power plant into the current used in the filter circuit of the electronic equipment. Diode rectifier filter circuit is generally divided into half-wave rectifier, full-wave rectifier and bridge rectifier, of which half-wave rectifier is the simplest, poor performance, used in low-demand occasions; full-wave rectifier works well, but needs intermediate tap transformer, so the current application is less, bridge rectifier is cheap, good performance. Therefore, bridge rectifier has been widely used.
Diode half wave rectifier circuit
220V single-phase AC is commutate by transformer T Buck and diode VD, used for load R. The voltage waveforms of each point in the circuit are plotted. It can be seen that the voltage on the load R becomes one-way voltage after the diode VD rectifier. In electronic equipment, there is a difference between the direct current and the direct current, but the current is one-way. Like a one-way valve, the diode can control the current only in the direction indicated by the diode. In Figure 4-1, three locations are connected to each other. For the sake of simplicity, grounding points are usually drawn near each other, so there are usually many grounding points in complex circuit diagrams. The instantaneous voltage at both ends of resistance R is different and the RMS is the same, that is, the peak reverse voltage of UR = 0.45 UvD diode is URM = V2 Uvp 1.414 UvD.
Diode bridge rectifier diode full wave rectifier and bridge rectifier have the same output waveform, because the diode is cheap, so bridge rectifier has been widely used. Diode bridge rectifier circuit, 4-2a, 50Hz, 220V AC waveforms, diode VD1 and VD4 (or VD2 and VD3) waveforms, indicating the load R waveforms.
Bridge rectifier circuit is widely used, so there is a special diode rectifier bridge power supply on the market. The rectifier bridge stack includes four diode rectifiers, most of which can be equipped with radiators and display physical and circuit symbols. When a rectifier bridge is used, the standard "~" is an input terminal connected to alternating current, the standard "+" is the output terminal of the positive electrode, and the marked "" is the output terminal of the negative electrode. The instantaneous voltage change at the two ends of the resistor R is the same as the effective value, that is, Ur = 0.9 UVD.